**Find row number from a row name in R Stack Overflow**

Fast ways in R to get the first row of a data frame grouped by an identifier [closed] and needed to find a way to find the first and last instances of users bike hires. With 1 million users, 10 million trips per year and several years' data, my "for" loop was doing 1 user per second. I tried the "by" solution, and it failed to complete after an hour. At first I couldn't fathom what "Matt... Fast ways in R to get the first row of a data frame grouped by an identifier [closed] and needed to find a way to find the first and last instances of users bike hires. With 1 million users, 10 million trips per year and several years' data, my "for" loop was doing 1 user per second. I tried the "by" solution, and it failed to complete after an hour. At first I couldn't fathom what "Matt

**Selecting Rows by Partial Name Match in R Favorable Outcomes**

You can think of an r x c matrix as a set of r row vectors, each having c elements; or you can think of it as a set of c column vectors, each having r elements. The rank of a matrix is defined as (a) the maximum number of linearly independent column vectors in the matrix or (b) the maximum number of linearly independent row vectors in the matrix.... A Tricky Situation. Letâ€™s say we are working with R in the interactive mode. We have a dataframe that we are inspecting. We want to know various things about the dataframe such as how many rows â€¦

**R find the unique rows in a matrix ETH Zurich**

Re: [R] how to find a row index in a matrix or a data frame ? This message : [ Message body ] [ More options ] Related messages : [ Next message ] [ Previous message ] [ In reply to ] [ [R] how to find a row index in a matrix or a data frame ?... Fast ways in R to get the first row of a data frame grouped by an identifier [closed] and needed to find a way to find the first and last instances of users bike hires. With 1 million users, 10 million trips per year and several years' data, my "for" loop was doing 1 user per second. I tried the "by" solution, and it failed to complete after an hour. At first I couldn't fathom what "Matt

**R remove rows by a list of rownames Biostar S**

Subset is a very slow function , and I personally find it useless. I assume you have a data.frame, array, matrix called Mat with A, B, C as column names; then all you need to do is:... How do I remove entire rows of duplicates based on two different columns in a R dataframe? How do I separate data based on different variable values in R? How do I count the number of data in a column from a set of different data in R?

## How To Find A Row In R

### Reorder Data Frame Rows in R Datanovia

- [R] find a row identical to another Grokbase
- R remove rows by a list of rownames Biostar S
- R Row Indexes
- R Row and Column Names Seminar for Statistics

## How To Find A Row In R

### From: Luedde, Mirko Date: Thu, 25 Nov 2010 12:04:25 +0100. Hi all, thank you for quick help. Any ideas on (better) efficiency

- Sort a data frame rows in ascending order (from low to high) using the R function arrange() [dplyr package] Sort rows in descending order (from high to low) using arrange () in combination with the function desc () [ dplyr package]
- 4/12/2015Â Â· If you want to select the 11, on row 1 and column 2, and 8, on row 2 and column 3, this call will not give the wanted result. Instead, a submatrix gets returned, that spans the elements on row â€¦
- How could I select the rows of a dataset that have the maximum value in one variable and to do this nested in another variable. It is a dataframe in long format with repeated measures per subject.
- Sort a data frame rows in ascending order (from low to high) using the R function arrange() [dplyr package] Sort rows in descending order (from high to low) using arrange () in combination with the function desc () [ dplyr package]

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